DREAM.15 takes place Saturday at the Saitama Super Arena in Saitama,
Japan. The event airs live in the U.S. on HDNet (3 a.m. ET).

According to DREAM’s official website, O’Brien was only a kilogram over the 93-kilogram limit, and officials are allowing him to weigh in a second time. However, Ricco Rodriguez, who’s in Japan for a fight with Alistair Overeem that never materialized, posted a Twitter message stating that he may replace O’Brien in his fight with Gegard Mousasi.

Aoki, meanwhile, fights for the first time since his April title loss to Strikeforce champ Gilbert Melendez. Kawajiri, who’s 7-1 since a loss of his own to Melendez, is confident he’ll take the champ’s belt.

“This is a new day for Japanese MMA,” Kawajiri said. “So tomorrow I will win by knockout or submission.”